A strong odour coming from one's behind.
Trevor just let out a huge butt funk
av Bob Sachet 18 april 2006
Term used to describe one’s foul odor emitting from the anus. Also used to describe other foul odors not necessarily relative to the butt.
Stan reeks of butt funk because he's dirty.
av Dominic5160 14 april 2006
the unpleasant aroma that eminates from the crack of an unwashed buttock
bitch you need to wash that buttfunk from yo ass!!!
av crazy68 31 augusti 2009